<video>: The Video Embed element - HTML: Hypertext Markup Language
contained in the video. if set, the audio will be initially silenced. its default value is false, meaning that the audio will be played when the video is played. playsinline a boolean attribute indicating that the video is to be played "inline", that is within the element's playback area. note that the absence of this attribute does not imply that the video will always be played in fullscreen. poster a url for an image to be shown while the video is downloading. if this attribute isn't specified, nothing is displayed until the first frame is available, then the first frame is shown as the poster frame. preload this enumerated attribute is intended to provide a hint to the browser about what the author thinks will lead to the best user experience with regards to what content is loaded befor...
...of available tracks. you can also use addeventlistener() to listen for the addtrack and removetrack events. examples simple video example this example plays a video when activated, providing the user with the browser's default video controls to control playback. <!-- simple video example --> <!-- 'big buck bunny' licensed under cc 3.0 by the blender foundation. ...
...ple plays a video when activated, providing the user with the browser's default video controls to control playback. <!-- simple video example --> <!-- 'big buck bunny' licensed under cc 3.0 by the blender foundation. ...
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Video and audio content - Learn web development
our guide to media types and formats for help selecting the best containers and codecs for your needs, as well as to look up the right mime types to specify for each. other <video> features there are a number of other features you can include when displaying an html video. take a look at our next example: <video controls width="400" height="400" autoplay loop muted preload="auto" poster="poster.png"> <source src="rabbit320.mp4" type="video/mp4"> <source src="rabbit320.webm" type="video/webm"> <p>your browser doesn't support html video. here is a <a href="rabbit320.mp4">link to the video</a> instead.</p> </video> the resulting ui looks something like this: the new features are: width and height you can control the video size either with these attributes or with css...
...dio or video start playing right away, while the rest of the page is loading. you are advised not to use autoplaying video (or audio) on your sites, because users can find it really annoying. loop makes the video (or audio) start playing again whenever it finishes. this can also be annoying, so only use if really necessary. muted causes the media to play with the sound turned off by default. poster the url of an image which will be displayed before the video is played. it is intended to be used for a splash screen or advertising screen. preload used for buffering large files; it can take one of three values: "none" does not buffer the file "auto" buffers the media file "metadata" buffers only the metadata for the file you can find the above example available to play live...
...a typical example might look like so: <audio controls> <source src="viper.mp3" type="audio/mp3"> <source src="viper.ogg" type="audio/ogg"> <p>your browser doesn't support html5 audio. here is a <a href="viper.mp3">link to the audio</a> instead.</p> </audio> this ...
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Creating a cross-browser video player - Developer guides
markup to start off with, let's take a look at the html that makes up the player. the video first of all the <video> element is defined, contained within a <figure> element that acts as the video container. to anyone familiar with html5 markup and the <video> element, there should be nothing here that surprises you. ...
...tart off with, let's take a look at the html that makes up the player. the video first of all the <video> element is defined, contained within a <figure> element that acts as the video container. to anyone familiar with html5 markup and the <video> element, there should be nothing here that surprises you. ...
...e-flash" data="flash-player.swf?videourl=video/tears-of-steel-battle-clip-medium.mp4" width="1024" height="576"> <param name="movie" value="flash-player.swf?videourl=video/tears-of-steel-battle-clip-medium.mp4" /> <param name="allowfullscreen" value="true" /> <param name="wmode" value="transparent" /> <param name="flashvars" value="controlbar=over&amp;image=img/poster.jpg&amp;file=flash-player.swf?videourl=video/tears-of-steel-battle-clip-medium.mp4" /> <img alt="tears of steel poster image" src="img/poster.jpg" width="1024" height="428" title="no video playback possible, please download the video from the link below" /> </object> <!-- offer download --> <a href="video/tears-of-steel-battle-clip-medium.mp4">download mp4</a> </vide...
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Handling media support issues in web content - Web media technologies
le the situation when the user's browser can't handle a particular type of media. this guide covers techniques you can use to develop web content that meets your media needs while providing the most broadly compatible experience possible. topics we will examine fallbacks, baseline media formats, and error handling practices that will let your content work in as many situations as possible. ...
...when the user's browser can't handle a particular type of media. this guide covers techniques you can use to develop web content that meets your media needs while providing the most broadly compatible experience possible. topics we will examine fallbacks, baseline media formats, and error handling practices that will let your content work in as many situations as possible. ...
...l let your content work in as many situations as possible. using poster frames a poster frame is a still image that's representative of the content of a video. this may be simply the first frame of video; however, in many cases, the first frame is blank, or contains nothing but the logo of a business, or some other image that doesn't give the reader any context for the video's contents. a good poster frame is one which is either a representative of the video's contents, or is an image which isn't even from the video itself but contains imagery and/or text which gives the reader a useful idea of the video's contents. in the case of an action movie, for example, the poster frame might be an iconic exemplar image from one of the film's best-known scenes. a similar concept can be applied to stil...
... best-known scenes. a similar concept can be applied to still images; if an image you wish to present is very large and may take time to download (especially for slower devices or connections), you can offer a lower-resolution or alternate version that will be displayed until the full-quality version is available to be displayed. we'll look at both of these scenarios and how to implement them. poster frames for video progressive images images—whether embedded using <img> or <picture>—don't support a concept similar to poster frames. however, there are ways to present an image in low quality while it's still loading. this requires creating your images using progressive formats, such as progressive jpeg or interlaced png. once your image has been converted to progressive form, you can si...

HTMLVideoElement.videoHeight - Web APIs
in css pixels. in simple terms, this is the height of the media in its natural size. see about intrinsic width and height for more details. syntax height = htmlvideoelement.videoheight; value an integer value specifying the intrinsic height of the video in css pixels. if the element's readystate is htmlmediaelement.have_nothing, then the value of this property is 0, because neither video nor poster frame size information is yet available. about intrinsic width and height a user agent calculates the intrinsic width and height of the element's media by starting with the media's raw pixel width and height, then taking into account factors including: the media's aspect ratio. the media's clean aperture (the sub-rectangle centered within the media that matches the target aspect ratio). th...
... height of the element's media by starting with the media's raw pixel width and height, then taking into account factors including: the media's aspect ratio. the media's clean aperture (the sub-rectangle centered within the media that matches the target aspect ratio). the target device's resolution. any other factors required by the media format. ...
...th the media's raw pixel width and height, then taking into account factors including: the media's aspect ratio. the media's clean aperture (the sub-rectangle centered within the media that matches the target aspect ratio). the target device's resolution. any other factors required by the media format. if the element is currently displaying the poster frame rather than rendered video, the poster frame's intrinsic size is considered to be the size of the <video> element. if at any time the intrinsic size of the media changes and the element's readystate isn't have_nothing, a resize event will be sent to the <video> element. this can happen when the element switches from displaying the poster frame to displaying video content, or when the displayed video track changes. example this exam...

HTMLVideoElement.videoWidth - Web APIs
ssed in css pixels. in simple terms, this is the width of the media in its natural size. see about intrinsic width and height for more details. syntax width = htmlvideoelement.videowidth; value an integer value specifying the intrinsic width of the video in css pixels. if the element's readystate is htmlmediaelement.have_nothing, then the value of this property is 0, because neither video nor poster frame size information is yet available. about intrinsic width and height a user agent calculates the intrinsic width and height of the element's media by starting with the media's raw pixel width and height, then taking into account factors including: the media's aspect ratio. the media's clean aperture (the sub-rectangle centered within the media that matches the target aspect ratio). th...
... height of the element's media by starting with the media's raw pixel width and height, then taking into account factors including: the media's aspect ratio. the media's clean aperture (the sub-rectangle centered within the media that matches the target aspect ratio). the target device's resolution. any other factors required by the media format. ...
...th the media's raw pixel width and height, then taking into account factors including: the media's aspect ratio. the media's clean aperture (the sub-rectangle centered within the media that matches the target aspect ratio). the target device's resolution. any other factors required by the media format. if the element is currently displaying the poster frame rather than rendered video, the poster frame's intrinsic size is considered to be the size of the <video> element. if at any time the intrinsic size of the media changes and the element's readystate isn't have_nothing, a resize event will be sent to the <video> element. this can happen when the element switches from displaying the poster frame to displaying video content, or when the displayed video track changes. example this exam...

Handling common HTML and CSS problems - Learn web development
e html <video>, <audio>, and <canvas> (and other features besides) have natural mechanisms for fallbacks to be added, which work on the same principle as described above. you can add fallback content in between the opening and closing tags, and non-supporting browsers will effectively ignore the outer element and run the nested content. ...
...o>, <audio>, and <canvas> (and other features besides) have natural mechanisms for fallbacks to be added, which work on the same principle as described above. you can add fallback content in between the opening and closing tags, and non-supporting browsers will effectively ignore the outer element and run the nested content. ...

HTML parser threading
r. likewise for the tree builders. the "last was carriage return" flag is copied over also. a runnable is dispatched to the parser thread to call to mark the parser uninterrupted and to call nshtml5streamparser::parseavailabledata() on the parser thread. mtokenizermutex is released. speculative loads when the tree builder on the parser thread encounters html script, stylesheet link, video (with a poster frame), base or img or svg script, style or image elements, preload operations are appended to a speculative load queue. there speculative load operations are flushed to the main thread (via the staging area) whenever tree ops are flushed and also whenever nshtml5streamparser::parseavailabledata() is about to stop working. that is, when the parser thread is parsing speculatively, speculative load...
...te() tokenizer/tree builder synchronously also sends speculative loads to the tree op executor. the executor acts on the speculative load queue when the runnable dispatched by nshtml5streamparser::parseavailabledata() fires and right before executing tree ops whenever tree ops are executed. when the executor acts on speculative loads, it starts speculative http fetches for images (including video poster frames), style sheets and scripts. additionally, the speculative load queue is used for transferring information from the parser thread to the main thread when the information needs to arrive before starting any speculative loads and when the information is known not to be speculative. there are two such pieces of information: the manifest url for an app cache manifest and the character encoding ...

NDEFRecord.recordType - Web APIs
"absolute-url" represents an absolute url ndef record. "mime" represents a mime type ndef record. ...
... "absolute-url" represents an absolute url ndef record. "mime" represents a mime type ndef record. ...

Audio and Video Delivery - Developer guides
hat don't support audio tag --> <a href="audiofile.mp3">download audio</a> </audio> the code above will create an audio player that attempts to preload as much audio as possible for smooth playback. note: the preload attribute may be ignored by some mobile browsers. ...
...we instruct the video to autoplay but to be muted by default. note: the autoplay attribute may be ignored by some mobile browsers. also, the autoplay feature can be controversial when misused. it's strongly recommended that you read the autoplay guide for media and web audio apis to learn how to use autoplay wisely.. for further info see <video> element and cr...

Web video codec guide - Web media technologies
r above (as well as the stepping and other significant compression artifacts). those fringes are the ringing effect. ringing is similar in some respects to mosquito noise, except that while the ringing effect is more or less steady and unchanging, mosquito noise shimmers and moves. ringing is another type of artifact that can make it particularly difficult to read text contained in your images. posterizing posterization occurs when the compression results in the loss of color detail in gradients. instead of smooth transitions through the various colors in a region, the image becomes blocky, with blobs of color that approximate the original appearance of the image. note the blockiness of the colors in the plumage of the bald eagle in the photo above (and the snowy owl in the background). th...
...s in the loss of color detail in gradients. instead of smooth transitions through the various colors in a region, the image becomes blocky, with blobs of color that approximate the original appearance of the image. note the blockiness of the colors in the plumage of the bald eagle in the photo above (and the snowy owl in the background). the details of the feathers is largely lost due to these posterization artifacts. contouring contouring or color banding is a specific form of posterization in which the color blocks form bands or stripes in the image. this occurs when the video is encoded with too coarse a quantization configuration. as a result, the video's contents show a "layered" look, where instead of smooth gradients and transitions, the transitions from color to color are abrupt, ca...

MitM - MDN Web Docs Glossary: Definitions of Web-related terms
he letter, read it, eventually modify it, repackage it, and give it to you. you wouldn't know there's a man in the middle in your communication channel – the mailman is invisible to you and to your recipient. in physical mail and in online communication, mitm attacks are tough to defend. a few tips: don't just ignore certificate warnings. you could be connecting to a phishing server or an imposter server. sensitive sites without https encryption on public wi-fi networks aren't trustworthy. check for https in your address bar and ensure encryption is in-place before logging in. learn more owasp article: man-in-the-middle attack wikipedia: man-in-the-middle attack the public-key-pins header (hpkp) can significantly decrease the risk of mitm by instructing browsers to require a whit...

mozbrowseractivitydone
ery user. there may also be large incompatibilities between implementations and the behavior may change in the future. the mozbrowseractivitydone event is fired when something inside the browser <iframe> triggers a web activity, and that web activity's message is consumed by the receiving app. if the activity has a returnvalue set to true, then the activity is consumed when postresult or posterror is invoked on the activity by the receiving app. note: for activities where the receiving app's activity definition in its manifest does not include returnvalue or returnvalue is false, no mozbrowseractivitydone event will be generated as of the landing of bug 1194525 in firefox os 2.5. postresult and posterror calls made on such an activity will be ignored and have no effect. general info...

HTMLMedia​Element​.textTracks - Web APIs
lement.texttracks; value a texttracklist object representing the list of text tracks included in the media element. the list of tracks can be accessed using array notation, or using the object's gettrackbyid() method. each track is represented by a texttrack object which provides information about the track. ...

HTMLVideoElement - Web APIs
middle" alignment-baseline="middle">htmlvideoelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties inherits properties from its ancestor interfaces, htmlmediaelement, and htmlelement. htmlvideoelement.height is a domstring that reflects the height html attribute, which specifies the height of the display area, in css pixels. htmlvideoelement.poster is a domstring that reflects the poster html attribute, which specifies an image to show while no video data is available. htmlvideoelement.videoheight read only returns an unsigned integer value indicating the intrinsic height of the resource in css pixels, or 0 if no media is available yet. htmlvideoelement.videowidth read only returns an unsigned integer value indicating the intrinsic w...